When you draw a vector, it's a lot like the HYPOTENUSE of a right angle triangle.

当你画一个箭头时，它很像 直角三角形的斜边。

For example, the isosceles or the scalene, or really any much either of these two can also be a " right angle triangle" .

例如，等腰或斜角，或者这两者中的任何一个都可以是“直角三角形”。

Trigonometry -- which we use to calculate the angles and sides of triangles -- is going to come up a lot in physics, because we'll be using right angle triangles all the time.

三角学——我们用来计算三角形的角度和边——在物理学中会经常出现，因为我们将一直使用直角三角形。